DM15L Info

• Date : September 2021
• From : Swiss Micros (direct)
• Price : £95
• Serial : 21350
• New Battery
  • July 27^th 2022
  • July 26^th 2024

sudo lpc21isp <firmware_file> /dev/ttyUSB0 115200 12000

cp210x_universal_windows_driver.zip

voyage_firmware_tool.zip

• From HP Forum https://www.hpmuseum.org/forum/thread-20046.html

Tabulated List of LF15C firmware versions

The firmware behaves mostly like a normal HP15C with a few differences:

• Press f I in normal mode to create & destroy a complex number from⇔to y (real) and x (imaginary)

• 3ENTER4
  • Y: 3.000
  • X: 4.000

• fI creates
• X: 3.000 4.000i

• Press f (i) to change x to its complex conjugate
  • X: 3.000 -4.000i

• Press fRe<>Im to switch Real and Imaginary parts of complex number in x
  • X: -4.000 3.000i

• Press f I will destroy the complex number back to y (real) and x (imaginary)
• Y: -4.000
• X: 3.000

• FIX/SCI/ENG don't round numbers unless gRND is pressed. Section 5 (page 59) of the manual suggests that the precision set with SCI sets how the number is rounded during operation
• fENGnn sets the number of significant digits as requested, UNLIKE the original HP15C where fENGn sets the significant digits to n + 1

• To run a program other than A-E press f LBL ## which is different than on the original HP15C where to run a label you used GSB##

• Long press STO to dump program memory to serial. Long press RCL to put the calculator in listen mode, where numbers received on the serial interface are written to program memory. The speed of the serial port is 57600 baud.

• In program mode, f CLEAR PREFIX places the runTime opCode in the program. runTime writes to x the program execution time once it's executed.

• Indirect addressing the labels A to E is done with I = 100 to 104. NOT SURE ABOUT THIS
• There are 10 user flags, from 0 to 9.

• Long press GTO in program mode to access go to label feature (single press in run mode)
• Long press GSB in program mode to access go to line feature (single press in run mode)

• f →R and g→P apply on complex numbers - NOT between x and y stack levels.
  • R and P are mode switching commands. When in Polar mode ALL Complex numbers on the stack are in Magnitude/Angle format and normal arithmetic can be done in this mode.
  • this is unlike the HP15C, where complex arithmetic has to be done in Rectangular mode - and Polar format numbers must be converted → R first.
  • To confirm the mode in use an annunciator is always present R or P

• It’s possible to delete a single program with f CLEAR PRGM followed by a label
• f and a long press on CLEAR PRGM deletes the entire program memory

• f USER and gMEM are not implemented and don't do anything at the moment.

• When running a program step by step, a long press on SST doesn’t execute the current step.

• SOLVE and Integrate work in similar ways to stock HP-15C

• Serial Port dump info : https://www.hpmuseum.org/forum/thread-20046-post-194697.html#pid194697
• Serial Port settings
  • Rate : 57600
  • Data : 8 bit
  • Stop : 1 bit
  • Parity : None
  • Flow Control : None
• To extract a dump from calculator press and hold STO
  • the non-zero digits can be copy/pasted into a text file for storage
• To upload a previously saved dump
  • copy it to clipboard and then
  • press and hold RCL until the terminal shows Paste PrgMemory:
  • in Putty ShiftInsert to paste clipboard text into terminal

• RTC is not capable of calibration/correction
• RTC appears to continue running even when switching firmware
  • LF15C has no ability to display RTC but it the rate appears unaffected by the firmware changes

• Firmware : https://technical.swissmicros.com/voyager/firmware/
• Documentation : Online HTML User Manual
• Documentation : PDF Manual
• Product Page : DM15L

Download from https://literature.hpcalc.org/

• HP-15C Owner's Handbook : https://literature.hpcalc.org/community/hp15c-oh-en.pdf
• HP-15C Advanced Functions Handbook : https://literature.hpcalc.org/community/hp15c-afh-en.pdf

• See DM15L Progs